无法将新闻项附加到数据透视表中的用户

如何解决无法将新闻项附加到数据透视表中的用户

这是a previous post

的后续帖子

我正在尝试通过数据透视表将新闻项附加到用户，以便在他们登录后向每个用户显示新闻项。这种想法是，当用户看到某项新闻时，他们可以选中一个框来分离该项目，不再看到它。

我的新闻项似乎正在保存，但是没有任何数据存储在数据透视表中以将它们与用户相关联。理想情况下，保存新闻项后，应将其附加到所有用户。

迁移

create_news_table

class CreateNewsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('news',function (Blueprint $table) {
            $table->increments('id');
            $table->string('title');
            $table->string('body');
            $table->boolean('sticky');
            $table->boolean('draft');
            $table->timestamps();
        });
    }

create_news_user_pivot_table

class CreateNewsUserPivotTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('news_user',function (Blueprint $table) {
            $table->integer('user_id')->unsigned();
            $table->integer('news_id')->unsigned();
            $table->foreign('user_id')->references('id')->on('users')
                ->onDelete('cascade');
            $table->foreign('news_id')->references('id')->on('news')
                ->onDelete('cascade');
            $table->timestamps();
        });
    }

模型

News.php

namespace App;

use Illuminate\Database\Eloquent\Model;
use App\News;

class News extends Model
{
    protected $table = 'news';
    protected $fillable = ['title','body','sticky','draft',];

    public function users() 
    {
        return $this->belongsToMany('App\News')->withPivot('user_id','news_id');
    }
}

User.php

class User extends Authenticatable {

        use Notifiable;
        use SoftDeletes;


        //protected $table = "users";
        /**
         * The attributes that are mass assignable.
         *
         * @var array
         */
        protected $fillable = [
            'name','email','password','profilePic','role','verify','first_time_login','changedPasswordDate','needToChangePassword','userRoles'
        ];

        protected $dates = ['deleted_at'];

        /**
         * The attributes that should be hidden for arrays.
         *
         * @var array
         */
        protected $hidden = [
            'password','remember_token',];

        public function news() {
            return $this->belongsToMany('App\News')->withPivot('user_id','news_id');
        }
}

NewsUser.php （甚至不确定我是否需要数据透视表模型）

namespace App;

use Illuminate\Database\Eloquent\Model;

class NewsUser extends Model {

    protected $table = 'news_user';
    protected $fillable = ["user_id","news_id"];
}

控制器中的相关功能

public function saveNews(Request $request) {
        $user = Auth::user();

        $news = new News;
        $news->title = $request->title;
        $news->body = $request->body;
        $news->sticky = $request->sticky;
        $news->draft = $request->draft;
        $news->save();
        $user->news()->attach($news->id);
    }

我意识到最后一个功能只是尝试将新闻发布添加到当前用户，但是如果我解决了这个问题，那么以后我可以弄清楚如何将新闻项附加到所有用户。我猜是这样的：

$users = \App\User::all()

foreach $users as $user {
    $user->news()->attach($news->id);
}

解决方法

我在这里return $this->belongsToMany('App\News')->withPivot('user_id','news_id');

在用户模型中尝试使用return $this->belongsToMany('App\News','news_user','user_id','news_id');，在新闻模型中尝试进行相反的操作，因为将显示belongsToMany()外键，withPivot()添加了额外的属性，但是您使用了它的外键，因为它是额外的属性

,

在同一位置查看所有代码后，发现了几个问题。

News.php

public function users()

应该是

public function user()

并且它还返回错误，“ App \ News”应为“ App \ User”

return $this->belongsToMany('App\News')->withPivot('user_id','news_id');

应该是

return $this->belongsToMany('App\User','news_id');

然后在我的控制器中，将新闻项保存后将其附加到所有用户

foreach ($users as $user) {
    $news->user()->attach($user->id);
}